<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>绝对定位</title>
    <style>
        .fu {
            background-color: #ff0;
            position: relative;
            width: 500px;
        }
        .fu > div {width: 100px;height: 100px;}
        .z1 {background-color: #f00;}
        .z2 {
            background-color: #0f0;
            position: absolute;/*使用绝对定位*/
            right: 0;
            bottom: 0;
        }
        .z3 {
            background-color: #00f;
        }
    </style>
</head>
<body>
<div class="fu">
    <div class="z1"></div>
    <div class="z2"></div>
    <div class="z3"></div>
</div>
</body>
</html>